Large Magnetocaloric Effect at the Saturation Field of an S=1/2 Antiferromagnetic Heisenberg Chain
2010 | conference paper. A publication with affiliation to the University of Göttingen.
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Large Magnetocaloric Effect at the Saturation Field of an S=1/2 Antiferromagnetic Heisenberg Chain
Lang, M.; Tsui, Y.; Wolf, B.; Jaiswal-Nagar, D.; Tutsch, U.; Honecker, A. & Removic-Langer, K. et al. (2010)
Journal of Low Temperature Physics, 159(1-2) pp. 88-91. 9th International Conference on Research in High Magnetic Fields (RHMF 2009), Dresden, GERMANY.
New york: Springer. DOI: https://doi.org/10.1007/s10909-009-0092-8
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Details
- Authors
- Lang, M.; Tsui, Yeekin; Wolf, B.; Jaiswal-Nagar, Deepshikha; Tutsch, Ulrich; Honecker, Andreas; Removic-Langer, Katarina; Prokofiev, Andrey; Assmus, Wolf; Donath, Guido
- Abstract
- We report low-temperature magnetization measurements on a copper-containing coordination polymer [Cu(mu-C(2)O(4))(4-aminopyridine)(2)(H(2)O)] (n) . According to these measurements and previous results (Prokofiev et al. in Cryst. Res. Technol. 42, 394, 2007), the material is a very good realization of an S = 1/2 antiferromagnetic Heisenberg chain with a small saturation field B (s) = 4.2 T, which marks the endpoint of a quantum-critical line in the B-T plane. Measurements of the magnetocaloric effect at low temperatures T = 0.47 K across the saturation field yields a very large magnetothermal response with a characteristic sign change close to the quantum-critical point. The data are in good agreement with the quantum-critical behavior calculated on the basis of exact diagonalization and quantum Monte Carlo simulations.
- Issue Date
- 2010
- Status
- published
- Publisher
- Springer
- Journal
- Journal of Low Temperature Physics
- Conference
- 9th International Conference on Research in High Magnetic Fields (RHMF 2009)
- Conference Place
- Dresden, GERMANY
- ISSN
- 0022-2291
